/**
 * Copyright (c) 2008-2011, http://www.snakeyaml.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.pyyaml;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.emitter.Emitter;
import org.yaml.snakeyaml.emitter.EventConstructor;
import org.yaml.snakeyaml.events.CollectionStartEvent;
import org.yaml.snakeyaml.events.Event;
import org.yaml.snakeyaml.events.MappingStartEvent;
import org.yaml.snakeyaml.events.NodeEvent;
import org.yaml.snakeyaml.events.ScalarEvent;
import org.yaml.snakeyaml.events.SequenceStartEvent;
import org.yaml.snakeyaml.parser.Parser;
import org.yaml.snakeyaml.parser.ParserImpl;
import org.yaml.snakeyaml.reader.StreamReader;
import org.yaml.snakeyaml.reader.UnicodeReader;

/**
 * @see imported from PyYAML
 */
public class PyEmitterTest extends PyImportTest {
    public void testEmitterOnData() throws IOException {
        _testEmitter(".data", false);
    }

    public void testEmitterOnCanonicalNormally() throws IOException {
        _testEmitter(".canonical", false);
    }

    public void testEmitterOnCanonicalCanonically() throws IOException {
        _testEmitter(".canonical", true);
    }

    private void _testEmitter(String mask, boolean canonical) throws IOException {
        File[] files = getStreamsByExtension(mask, true);
        assertTrue("No test files found.", files.length > 0);
        for (File file : files) {
            // if (!file.getName().contains("spec-06-01.canonical")) {
            // continue;
            // }
            try {
                InputStream input = new FileInputStream(file);
                List<Event> events = parse(input);
                input.close();
                //
                StringWriter stream = new StringWriter();
                DumperOptions options = new DumperOptions();
                options.setCanonical(canonical);
                Emitter emitter = new Emitter(stream, options);
                for (Event event : events) {
                    emitter.emit(event);
                }
                //
                String data = stream.toString();
                List<Event> newEvents = new ArrayList<Event>();
                StreamReader reader = new StreamReader(data);
                Parser parser = new ParserImpl(reader);
                while (parser.peekEvent() != null) {
                    Event event = parser.getEvent();
                    newEvents.add(event);
                }
                // check
                assertEquals(events.size(), newEvents.size());
                Iterator<Event> iter1 = events.iterator();
                Iterator<Event> iter2 = newEvents.iterator();
                while (iter1.hasNext()) {
                    Event event = iter1.next();
                    Event newEvent = iter2.next();
                    assertEquals(event.getClass().getName(), newEvent.getClass().getName());
                    if (event instanceof NodeEvent) {
                        NodeEvent e1 = (NodeEvent) event;
                        NodeEvent e2 = (NodeEvent) newEvent;
                        assertEquals(e1.getAnchor(), e2.getAnchor());
                    }
                    if (event instanceof CollectionStartEvent) {
                        CollectionStartEvent e1 = (CollectionStartEvent) event;
                        CollectionStartEvent e2 = (CollectionStartEvent) newEvent;
                        assertEquals(e1.getTag(), e2.getTag());
                    }
                    if (event instanceof ScalarEvent) {
                        ScalarEvent e1 = (ScalarEvent) event;
                        ScalarEvent e2 = (ScalarEvent) newEvent;
                        if (e1.getImplicit().bothFalse() && e2.getImplicit().bothFalse()) {
                            assertEquals(e1.getTag(), e2.getTag());
                        }
                        assertEquals(e1.getValue(), e2.getValue());
                    }
                }
            } catch (Exception e) {
                System.out.println("Failed File: " + file);
                // fail("Failed File: " + file + "; " + e.getMessage());
                throw new RuntimeException(e);
            }
        }
    }

    public void testEmitterStyles() throws IOException {
        File[] canonicalFiles = getStreamsByExtension(".canonical", false);
        assertTrue("No test files found.", canonicalFiles.length > 0);
        File[] dataFiles = getStreamsByExtension(".data", true);
        assertTrue("No test files found.", dataFiles.length > 0);
        List<File> allFiles = new ArrayList<File>(Arrays.asList(canonicalFiles));
        allFiles.addAll(Arrays.asList(dataFiles));
        for (File file : allFiles) {
            try {
                List<Event> events = new ArrayList<Event>();
                InputStream input = new FileInputStream(file);
                StreamReader reader = new StreamReader(new UnicodeReader(input));
                Parser parser = new ParserImpl(reader);
                while (parser.peekEvent() != null) {
                    Event event = parser.getEvent();
                    events.add(event);
                }
                input.close();
                //
                for (Boolean flowStyle : new Boolean[] { Boolean.FALSE, Boolean.TRUE }) {
                    for (DumperOptions.ScalarStyle style : DumperOptions.ScalarStyle.values()) {
                        List<Event> styledEvents = new ArrayList<Event>();
                        for (Event event : events) {
                            if (event instanceof ScalarEvent) {
                                ScalarEvent scalar = (ScalarEvent) event;
                                event = new ScalarEvent(scalar.getAnchor(), scalar.getTag(),
                                        scalar.getImplicit(), scalar.getValue(),
                                        scalar.getStartMark(), scalar.getEndMark(), style.getChar());
                            } else if (event instanceof SequenceStartEvent) {
                                SequenceStartEvent seqStart = (SequenceStartEvent) event;
                                event = new SequenceStartEvent(seqStart.getAnchor(),
                                        seqStart.getTag(), seqStart.getImplicit(),
                                        seqStart.getStartMark(), seqStart.getEndMark(), flowStyle);
                            } else if (event instanceof MappingStartEvent) {
                                MappingStartEvent mapStart = (MappingStartEvent) event;
                                event = new MappingStartEvent(mapStart.getAnchor(),
                                        mapStart.getTag(), mapStart.getImplicit(),
                                        mapStart.getStartMark(), mapStart.getEndMark(), flowStyle);
                            }
                            styledEvents.add(event);
                        }
                        // emit
                        String data = emit(styledEvents);
                        List<Event> newEvents = parse(data);
                        assertEquals("Events must not change. File: " + file, events.size(),
                                newEvents.size());
                        Iterator<Event> oldIter = events.iterator();
                        Iterator<Event> newIter = newEvents.iterator();
                        while (oldIter.hasNext()) {
                            Event event = oldIter.next();
                            Event newEvent = newIter.next();
                            assertEquals(event.getClass(), newEvent.getClass());
                            if (event instanceof NodeEvent) {
                                assertEquals(((NodeEvent) event).getAnchor(),
                                        ((NodeEvent) newEvent).getAnchor());
                            }
                            if (event instanceof CollectionStartEvent) {
                                assertEquals(((CollectionStartEvent) event).getTag(),
                                        ((CollectionStartEvent) newEvent).getTag());
                            }
                            if (event instanceof ScalarEvent) {
                                ScalarEvent scalarOld = (ScalarEvent) event;
                                ScalarEvent scalarNew = (ScalarEvent) newEvent;
                                if (scalarOld.getImplicit().bothFalse()
                                        && scalarNew.getImplicit().bothFalse()) {
                                    assertEquals(scalarOld.getTag(), scalarNew.getTag());
                                }
                                assertEquals(scalarOld.getValue(), scalarNew.getValue());
                            }
                        }
                    }
                }

            } catch (Exception e) {
                System.out.println("Failed File: " + file);
                // fail("Failed File: " + file + "; " + e.getMessage());
                throw new RuntimeException(e);
            }
        }
    }

    private String emit(List<Event> events) throws IOException {
        StringWriter writer = new StringWriter();
        Emitter emitter = new Emitter(writer, new DumperOptions());
        for (Event event : events) {
            emitter.emit(event);
        }
        return writer.toString();
    }

    private List<Event> parse(String data) {
        ParserImpl parser = new ParserImpl(new StreamReader(data));
        List<Event> newEvents = new ArrayList<Event>();
        while (parser.peekEvent() != null) {
            newEvents.add(parser.getEvent());
        }
        return newEvents;
    }

    @SuppressWarnings("unchecked")
    public void testEmitterEvents() throws IOException {
        File[] files = getStreamsByExtension(".events", false);
        assertTrue("No test files found.", files.length > 0);
        for (File file : files) {
            // if (!file.getName().contains("spec-06-01.canonical")) {
            // continue;
            // }
            try {
                List<Event> events = new ArrayList<Event>();
                String content = getResource(file.getName());
                events = (List<Event>) load(new EventConstructor(), content);
                //
                StringWriter stream = new StringWriter();
                Emitter emitter = new Emitter(stream, new DumperOptions());
                for (Event event : events) {
                    emitter.emit(event);
                }
                //
                String data = stream.toString();
                List<Event> newEvents = new ArrayList<Event>();
                StreamReader reader = new StreamReader(data);
                Parser parser = new ParserImpl(reader);
                while (parser.peekEvent() != null) {
                    Event event = parser.getEvent();
                    newEvents.add(event);
                }
                // check
                assertEquals(events.size(), newEvents.size());
                Iterator<Event> iter1 = events.iterator();
                Iterator<Event> iter2 = newEvents.iterator();
                while (iter1.hasNext()) {
                    Event event = iter1.next();
                    Event newEvent = iter2.next();
                    assertEquals(event.getClass().getName(), newEvent.getClass().getName());
                    if (event instanceof NodeEvent) {
                        NodeEvent e1 = (NodeEvent) event;
                        NodeEvent e2 = (NodeEvent) newEvent;
                        assertEquals(e1.getAnchor(), e2.getAnchor());
                    }
                    if (event instanceof CollectionStartEvent) {
                        CollectionStartEvent e1 = (CollectionStartEvent) event;
                        CollectionStartEvent e2 = (CollectionStartEvent) newEvent;
                        assertEquals(e1.getTag(), e2.getTag());
                    }
                    if (event instanceof ScalarEvent) {
                        ScalarEvent e1 = (ScalarEvent) event;
                        ScalarEvent e2 = (ScalarEvent) newEvent;
                        if (e1.getImplicit().canOmitTagInPlainScalar() == e2.getImplicit().canOmitTagInPlainScalar()
                                && e1.getImplicit().canOmitTagInNonPlainScalar() == e2.getImplicit().canOmitTagInNonPlainScalar()) {

                        } else {
                            if ((e1.getTag() == null || e2.getTag() == null)
                                    || e1.getTag().equals(e2.getTag())) {
                            } else {
                                System.out.println("tag1: " + e1.getTag());
                                System.out.println("tag2: " + e2.getTag());
                                fail("in file: " + file);
                            }
                        }
                        assertEquals(e1.getValue(), e2.getValue());
                    }
                }
            } catch (Exception e) {
                System.out.println("Failed File: " + file);
                // fail("Failed File: " + file + "; " + e.getMessage());
                throw new RuntimeException(e);
            }
        }
    }
}